Paper-bag machine.



W. T. DULIN.

PAPER BAG MACHINE.

APPLICATION FILED JUNE 25,1913

Patented Dec. 15, 1914.

2 SHEETSSHEET l.

Inventor.- Wz'lliam TDuZilz N T l "3 Witnesses:

his attorney.

THE NORRIS PETERS L0 PHOTOLII'HO wAsmNmvN. D. c.

W. T. DULIN.

PAPER BAG MACHINE.

APPLICATION FILED JUNE 2c, 1913.

Patented Dec. 15, 1914.

2 SHEETS-SHEET 2.

Witnesses:

'HE. NURRIS PEHERS co PHOfO-LITHH v wA u|Nr pnrrnn sra'rns Parana" ornrcn.

WILLIAM r. DULIN, or rHrLAnnLrHIAl, PENNSYLVANIA.

PAPER-BAG IILACHINE.

, Specification of Letters Patent. PatentedDec, 15, 1914.

Application filed June 26, 1913. Serial No. 775,844.

monl known as self-o enin s uareoa er bags.

The present improvements are particularly directed to mechanism for folding the rear flap of the diamond fold in the formation of the bag bottom.

The object of my invention is toprovide means of the characterindicated, simple in construction, reliable and accurate in operation and having the ability to withstand without material deterioration long use at high speed. i

With these objects in view, my improvements are illustrated intheirpreferred form in the drawings accompanying this specification, wherein- Figure 1 is a plan view of so muchof a paper bag machine embodying my improvements as will suffice to clearly illustrate said improvements to those who are skilled in the art to which they pertain. Fig. 2 is a sectional elevation on line 2-2 of Fig. 1, and 2-2 of Fig. 3. Fig. 3 is an end elevation of what is shown in Fig. 1 and looking from the left-hand side of that figure. Fig. 1 is a plan view similar to that of a portion of Fig.1, and showing the parts indifferent positions from that of Fig. 1, to illustrate the operation of my improvements.

Before describingithe invention in detail I desire to have it understood that the invention is not limited to the particular construction and arrangement of parts which I have illustrated and shall hereinafter describe, and that various changes may be made in the mechanismwithout departing from the spirit or scope of the invention, and that the phraseology which I employ is for the purpose of description and not of limitation. i

i The general. art of paper bag machines is so well-known that the illustration and description of my improvements may suitably be confined to. the particular portions of a paper bag machine to which they pertain, and I have therefore only illustrated the rear flap folding cylinder 3 and its material appertinent mechanism. Said cylinder is fixed to shaft 1 whichmay be provided with the usual bearings in side frames, not shown. Said cylinder is provided with a. circumferential mid-portion 5 comprising one or more folding bedsas 6. Said cylinder, within the confines of folding bed 6, is provided with means for gripping a bag blank thereto, and j at that stage of-operation to which the pres ent invention s directed, said bag blank will comprise a tubular form, either with or without inwardly'folded side tucks therein, and the diamond fold of the bag bottom will have been formed. Said gripping means comprise means for gripping the forward portion of the blank at or near the line on which is presently to be folded front flap 10. I have chosen to illustrate said gripping means as comprising rockingblade 7 cometing with radialwall 11 of said cylinder, all;

of a general character well-known in the art. Rock shaft 12 of said gripper 7 projects outwardly from one or both ends of mid-portion 5 and may be actuated by some wellknown means, not shown. Rearwardly of said front gripping means, relatively to the direction of rotation of said cylinder, I provide opposite side clips 13 and 1 1 for gripping the rearward portion of the diamond fold ofthe blankto said cylinder-,just forward of the line on which rear flap 9 is to be folded over forwardly onto the bag bottom.

Said side clips as 13 may be pivotally mount;

ed belowthe face of the folding bed or cylinder periphery on studs as 15, fixed in' brackets as 16. Said side clips may be actuated toalternately grip and release said bag blank by some convenient means, not shown, but well-known in the art. For convenience of adjustment, and for engaging bags of different bottom lengths,I'have mounted said side clip brackets as 16, circumferentially adjustably. Saickbracket 16 is provided with a rearwardly reaching foot 17 conveniently slotted at 18 for the passage of set screw 19 threaded into the underside of folding bed (3. By loosening said set screw, bracket 16, carrying clip13, may be moved cireumferentially either forwardly or backwardly, and fixed in any chosen position. \Vhen saidbag blank isgripped to the folding bed by the front gripper and the opposite side clips, rear flap9 of the diamond fold will spring up more or less from the bag body 8, Fig. 3, whereby room between said fiap and body is afforded for the entrance therebetween of the rear flap folders. It will be understood that preferably the bag blank has been previously creased transversely on line 20.

My improved rear flap folders comprise opposite blade-like members 21 and 22 of oppositely helical conformation, their lead ing and operative ends 21 and 22 respectively. pointing inwardly toward each other and forwardly toward the direction of movement of said cylinden Said blade-like members are fixed to T-shaped slides 23 and 24: of similar oppositely helical conformation mounted in corresponding slots in op- 1 posite wing portions 25 and 26 of cylinder 3. The under faces of said slides comprise internal gear segments 27 and '28 for engagement with opposite toothed segments 29 and 30 respectively fixed to transverse shaft 31, having bearings in said cylinder, and the axis of said shaft is parallel with the axis of cylinder shaft l To one end of said segment shaft 31 is fixed-pinion 32 for engagement with gear segment 33 fixed to stud 37 pivotally mounted in said cylinder 3. On the outer .end of said stud is fixed arm 34:, carrying roll 35 for engagement with cam 36 mounted co-axially with shaft at and fixed relatively thereto.

- Itwill be observed that in Fig. 3 I have illustrated cylinder 3 as provided with oppositel'folding beds 6 and 60 and have illustrated that cylinder as adapted for carrying two opposite pairs of rear flap folders. I have, however, shown only one such pair of rear flap folders as suflicient for purposes ofillustration.

' The operation of my improved- -mechanism will be obvious from inspection of the drawings, and suffice it to say that blades 21 and 22 are actuated from cam 36. by'the mechanism just described, forwardly in the direction of rotation of said cylinder 3 and inwardly toward 'each'other from the positioniof Fig. 1 to that of Fig. 4, whereby rear flap 9 of the bag blank is folded down over side clips 13 and 14 onto the bag bottom. It will be obvious that paste or gum may be previously supplied to said bag bottom or flap so that said flap will remain in position on said bag bottom when folded thereagainst by said blades.

I claim:

1. In a machine of the class specified, the combination of a rotating cylinder, means for gripping a diamond folded bag blank thereto, opposite rear flap folders mounted for helical movement relatively to said cylinder for folding the rear flap of the dia- 2. In a machine of the class specified, the combination of a rotating cylinder, means for gripping the forward portion of a diamond folded bag blank thereto, opposite side clips'for gripping the rearward portionof the diamond fold of the blank to said cylinder, and means for adjusting said'forward and rearward grippers relatively circumferentially of said cylinder.

3. In a machine ofthe class specified, the combination of a rotating cylinder, -means forgripping the forward portion of a diamond folded bag blank thereto, opposite side clips for gripping the rearward portion of the diamond fold of-the blank'to saidcylinder, andmeans for'adjusting said side combination of a rotating cylinder, means for gripping the forward portion of a diaf mond folded bag blank thereto, opposite side clips for gripping the rearward portion of the diamond fold of the blank to said cylinder, means foradjusting said forthe rear flap of the diamond fold forwardly over said side clips onto the bag bottom, and

means for actuatingsaid rear flap folders.

5. In a machine of the class s'pecified, the

combination of a rotating cylinder, means for gripping the forward portion of a dia- 1 mond folded bagblank thereto, opposite side'clips for gripping the rearward portion of the diamond fold of the blank to said cylinder, means for adjusting said side clips circumferentially of said cylinder, opposite rear flap folders mounted for helical move.-

ment relatively to said cylinder for folding,

the rear flap of the diamond fold forwardly.

over said'side clips onto the bag bottom,

and means for actuating said rear flap 11.0

folders.

6. In a machine of the class specified, the combination of a rotating cylinder, means for gripping'a diamond folded bag blank thereto, opposite rear fiap foldersmounted for coincident operative movement coaxially with said cylinder and in the direction of rotation of said cylinder and toward each other for folding the rear fiapof' the .dia-

mond fold forwardly over said side clips :1

onto the bag bottom, and means for actuacting said rear flap folders.

7. In a machine of the class specified, rear flap folding means including in combination a rotating cylinder, means for gripping'a diamond folded bag blank thereto, opposite rear flap folders mounted for helical movement relatively to said cylinder and toward flap folding means including in combination a rotating cylinder, means for gripping a diamond folded bag blank thereto, opposite rear flap folders mounted for helical movement relatively to said cylinder and toward each other, internal gear segments on said rear fiap folders, opposite toothed segments rotatably mounted on fixed axes in said cylinder for engagement with the gear segments of said rear flap folders respectively, and means for oscillating said toothed segments.

9. In a machine of the class specified, rear flap folding means including in combination a rotating cylinder, means for gripping a diamond folded bag blank thereto, opposite rear flap folders mounted for helical movement relatively to said cylinder and toward each other, internal gear segments on said rear flap folders, opposite toothed segments fixed to a rock shaft in said cylinder, the axes of said rock shaft and cylinder being parallel, and means for oscillating said rock shaft.

10. In a machine of the class specified, rear flap folding means including in combination a rotating cylinder, means for gripping a diamond folded bag blank thereto, opposite rear flap folders mounted for helical movement relatively to said cylinder and toward each other, internal gear segments on said rear flap folders, opposite toothed segments fixed to a rock shaft in said cylinder, the axes of said rock shaft and cylinder being parallel, a pinion fixed to said rock shaft, a gear segment pivotally mounted on a fixed axis in said cylinder for engagement with said pinion, and means for oscillating said pinion.

segments rotatably mounted on fixed axes in said cylinder for coincident rotatable and axially sliding engagement with the gear segments of said rear flap folders, and means for oscillating said toothed segments.

12. In a machine of the class specified, rear flap folding means including in combi nation a rotating cylinder, means for gripping a diamond folded bag blank thereto, opposite rear flap folders mounted for helical movement relatively to said cylinder and toward each other, internal gear segments on said rear flap folders, opposite toothed segments rotatably mounted on a fixed axis in said cylinder for coincident rotatable and axially sliding engagement with the gear segments of said rear flap folders, a pinion fixed co-axially relatively to said segments, a gear segment pivotally mounted on a fixed axis in said cylinder for engagement with said pinion, and means for oscillating said gear segment.

Signed at Philadelphia, inthe county of Philadelphia and State of Pennsylvania, this 19 day of June, 1913, before two subscribing witnesses.

WILLIAM T. DULIN.

Witnesses WV. J. Hnssnonnrnn, M. T. MILLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

